Hallo,

i've read that some alternators can be tricked by inserting a diode in the sensing line of the voltage regulator.

Does someone know or have a tutorial for a '91 honda alternator? Or if it is possible to do with our alternators?

Thanks for your help
Best regards.

 

Built into the fusebox is the ELD. It detects electrical load going through the fusebox and makes the alternator charge at a higher output when load is high.
Alternator output is measured in amps, 60amps in this application, the charging voltage should be 13-14.5v DC. Increasing your voltage past this will fry your car, boil your battery, cause outgassing, and a host of other problems.
The only reason to mess with the ELD is if you have an amp running several hundred watts or more running directly off the battery. In that case, wire a relay so when the amp is on, the ELD is activated.
Honda alternators don't charge full out when not needed to get that extra bit of fuel efficiency so that is why.

 

From what i know, the european Model of the CRX Si with B16A1 engine has no ELD?!
I'am aware of the fact that increased voltage will stress Lightbulbs and the Battery.
But i have a special situation and i would only want to make the modification active under certain driving contitions for a short time.

My only Problem is, that i don't know the regulator in detail, why i asked for a method and if it is possible with our type of regulator.

Fuel consumption is not my concern ;-)

Hope someone can help.
Thanks

 

What exactly are you trying to accomplish?
What is you alternators out put now?



The ELD was only used in vehicles meant for the US market.

 

I'am just looking for a solution to increase the alternator output voltage by aprox. 1volt

 

What are these special conditions? If it is a stereo application, just rev the motor a little bit more instead of doing fancy diodes under 'certain conditions'. Dual batteries or a larger alternator to keep up with your demands would be easier than trying to wire some sort of 'if/then' switch with a resister to trick the ELD into requiring more voltage. It would probably just end up throwing a CEL for the ELD anyways.

 

Specify the conditions that require the extra volt.

Most vehicles have a current sensing device, called an Electronic Load Detector (or equivalent) that will vary the voltage depending on the need for current.

The ELD signal will vary the alternator field current to control the amount of power created. This is necessary in order to prevent damage to the battery and the alternator.

You do not need the extra volt, you simply need more current from your alternator, or battery. A bigger battery is the better option in this case, as the current in an inductor cannot instantaneously change. A battery is capacitive, and will supply as much current as possible to maintain the voltage required. If you have a voltage sag, its because to don't have enough capacitance.

 

And i want to follow up and say: Your special situation does NOT trump MATH AND SCIENCE. Its a 12v system. That is what its designed for. It charges at 13-14.5ish to create a difference in electrical potential. The 6 six cells in your battery will add up to 12.6 fully charged. Your not gonna get help by being vague.

 

Even if OP could gain a solid 13 or 14 volts by defeating the ELD the flip of a switch, the alternator is naturally going to produce about 14 volts when it charges the battery.
Maybe OP has an overly sensitive device in their car that needs stable voltage above 12v?

Yeah... Need to know what OP is really trying to do.

 

I have learned over the years but alternators have diodes that are built into them each diode represents two volts meeting if you have an alternator that is putting out 15 volts Max you have you have 8 diodes built into the alternator.
When your system is running perfectly and the way it should be and you're only putting out around 13 volts from the alternator and you put a load on it from a radio exedra the built-in regulator will allow More Voltage to come out of the alternator to help with the load.
If an alternator is built to put out 14 volts 15 volts or 16 volts that's all you're going to ever be able to get from.
In the case of let's say a motorhome they have alternators that are heavy duty to put more amps not volts all cars are made to work on 12 volts the alternator is there to just charge the battery and maintain the charge of the battery.
If you require more power it's not going to be voltage is going to be amps and watts that are increased you'll have to get a extra heavy duty alternator for that if you had a large stereo system there's no way around that